A Pythagorean triple consists of three positive integersa, b, and c, such that a2 + b2 = c2. A right triangle whose sides form a Pythagorean triple is called a Pythagorean triangle.Such a triple is commonly written (a, b, c), and well-known examples are:

(3, 4, 5), (5,12,13), (8,15,17), (7,24,25).

This is the right triangle formed by the Pythagorean triple (3,4,5)

This is the right triangle formed by the Pythagorean triple (5,12,13)

This is the right triangle formed by the Pythagorean triple (8,15,17)

This is the right triangle formed by the Pythagorean triple (7,24,25)

If (a, b, c) is a Pythagorean triple, then so is (ka, kb, kc) for any positive integer k.

A primitive Pythagorean triple (PPT) is one in which a, b and c are pairwise coprime.

There is a great formula that will generate an infinite number of Pythagoren Triples that are integers (not fractions).

Formula for generating Pythagorean Triples
Choose any two positive integers - call them s and t. Let s be larger than t. Then the following three numbers are a Pythagorean Triple:

{2st, s2-t2, s2+t2}

For instance, if s=5 and t =1, then 2st=10, s2-t2=25-1=24 and s2+t2=25+1=26.